Choosen As Best Answer

OA = OC = 12 => OD = 12 - 4 = 8
AD^2 = BC^2 = 12^2 - 8^2 = 80 (暫時不用開根號)
OB^2 = BC^2 + OC^2 = 80 + 12^2 = 224
OB = √224 = 4√14

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